/*
 * manybook.c - 包含多本书的图书目录
 */

#include <stdio.h>
#include <string.h>

char * s_gets(char * st, int n);

#define MAXTITL 40
#define MAXAUTL 40
#define MAXBKS 100
struct book {
    char title[MAXAUTL];
    char author[MAXAUTL];
    float value;
};

int main(void)
{
    struct book library[MAXBKS];
    int count = 0;
    int index;
    printf("Please enter the book title.\n");
    printf("Please [Enter] at the start of a line to stop.\n");
    while (count < MAXBKS && s_gets(library[count].title, MAXTITL) != NULL
            && library[count].title[0] != '\0') {
        printf("Now enter the author.\n");
        s_gets(library[count].author, MAXTITL);
        printf("Now enter the value.\n");
        scanf("%f", &library[count++].value);

        while (getchar() != '\n') {
            continue;
        }
        if (count < MAXBKS) {
            printf("Enter the next title.\n");
        }
        
    }

    if (count > 0) {
        printf("Here is the list of your books.\n");
        for (index = 0; index < count; index++) {
            printf("%s by %s: %2f.\n", library[index].title, library[index].author, library[index].value);
        }
    } else {
        printf("No books? Too bad\n");
    }
    return 0;
}

char * s_gets(char * st, int n) {
    char * ret_val;
    char * find;

    ret_val = fgets(st, n ,stdin);
    if (ret_val) {
        find = strchr(st, '\n');
        if (find) {
            *find='\0';
        } else {
            while (getchar() != '\n') {
                continue;
            }
        }
    }
    return ret_val;
}
